Android

2024-05-15 03:02| 来源: 网络整理| 查看: 265

这篇博客为大家介绍Android自定义相机，并且实现倒计时拍照功能

首先自定义拍照会用到SurfaceView控件显示照片的预览区域，以下是布局文件：

两个TextView是用来显示提示信息和倒计时的秒数的

接下来是mainActivity中的具体实现以及详细注释：

package com.dhsr.pujiejia.ui; import java.io.File; import java.io.FileOutputStream; import java.text.SimpleDateFormat; import java.util.Date; import android.annotation.SuppressLint; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.content.res.Configuration; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.PixelFormat; import android.hardware.Camera; import android.hardware.Camera.CameraInfo; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.Window; import android.view.WindowManager; import android.widget.TextView; import com.example.pujiejiaapp.R; @SuppressLint({ "NewApi", "SdCardPath" }) public class CameraActivity extends Activity implements Runnable { // 预览图片范围 private SurfaceView surfaceView; private TextView tv_time; // 倒计时拍摄 private int cameratime = 4; private Camera camera; private boolean preview = false; // 文件名字 private String filename; // 文件名字的带的时间戳 private String timeString; // 格式化时间 private SimpleDateFormat dateFormat; // 日期对象 private Date date; // 控制线程 boolean stopThread = false; private File file; String photo; private Handler mHandler = new Handler() { public void handleMessage(android.os.Message msg) { int what = msg.what; switch (what) { case 222: tv_time.setText("" + cameratime); if ("0".equals(tv_time.getText().toString())) { tv_time.setText("拍摄成功！"); takePhoto(); } break; } }; }; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); CameraActivity.this.setFinishOnTouchOutside(false); // 初始化数据 findView(); surfaceView.getHolder().addCallback(new SufaceListener()); /* 下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 */ surfaceView.getHolder() .setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); surfaceView.getHolder().setFixedSize(200, 200); // 设置分辨率 } @Override protected void onStart() { // TODO Auto-generated method stub super.onStart(); // 开启线程 new Thread(this).start(); } private final class SufaceListener implements SurfaceHolder.Callback { /** * surface改变 */ @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } /** * surface创建 */ @Override public void surfaceCreated(SurfaceHolder holder) { try { for (int i = 0; i < Camera.getNumberOfCameras(); i++) { CameraInfo info = new CameraInfo(); Camera.getCameraInfo(i, info); // 调用系统的前置摄像头 if (info.facing == CameraInfo.CAMERA_FACING_FRONT) { camera = Camera.open(i); } } Camera.Parameters parameters = camera.getParameters(); /* 每秒从摄像头捕获5帧画面， */ parameters.setPreviewFrameRate(5); /* 设置照片的输出格式:jpg */ parameters.setPictureFormat(PixelFormat.JPEG); /* 照片质量 */ parameters.set("jpeg-quality", 85); WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE); camera.setParameters(parameters); camera.setPreviewDisplay(surfaceView.getHolder());// 通过SurfaceView显示取景画面 camera.startPreview(); preview = true; } catch (Exception e) { } } /** * surface销毁 */ @Override public void surfaceDestroyed(SurfaceHolder holder) { if (camera != null) { if (preview) camera.stopPreview(); camera.release(); camera = null; } } } /** * 拍摄照片 */ private void takePhoto() { // 执行拍照效果 camera.takePicture(null, null, new Camera.PictureCallback() { @Override public void onPictureTaken(byte[] data, Camera camera) { try { Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length); timeString = formatDate(); //保存到data/data目录自定义文件夹下 filename = "/data/data/com.example.pujiejiaapp/images/" + timeString + ".jpg"; File file = new File(filename); boolean createNewFile = file.createNewFile() System.out.println("创建文件夹成功没有" + createNewFile); System.out.println(file); FileOutputStream outStream = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 60, outStream); outStream.flush(); outStream.close(); // 重新浏览 camera.stopPreview(); camera.startPreview(); preview = true; } catch (Exception e) { e.printStackTrace(); } finally { } } }); } @Override public void run() { while (!stopThread) { try { //按秒数倒计时 Thread.sleep(1000); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } cameratime--; mHandler.sendEmptyMessage(222); if (cameratime

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